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Credit Facility- Revolving Line of Credit (Details) - USD ($)			1 Months Ended
	Jul. 31, 2020	Jul. 30, 2020	Sep. 30, 2021	Mar. 31, 2022	Mar. 31, 2021
Revolving Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 50,000,000
Cash to be maintained per agreement			$ 100,000,000
Deferred revenue trailing period			5 months
Borrowing capacity				$ 50,000,000
Percentage of unused facility fee to be paid quarterly			0.15%
Current portion of total borrowing amount, subject to maximum debt to EBITDA ratio, financial covenant			$ 5,000,000
Revolving Line of Credit | Prime Rate
Debt Instrument [Line Items]
Margin on interest rate	0.75%	0.50%
Debt instrument, interest rate				3.50%	3.25%
Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity			4,000,000
Letter of Credit | Property Lease Guarantee
Debt Instrument [Line Items]
Letters of credit outstanding, amount				$ 1,200,000
Credit Card Sublimit
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 1,000,000

X

- Definition

Deferred revenue trailing period.

+ References

No definition available.

+ Details

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X

- Definition

Short-Term Borrowing Amount, Subject To Maximum Debt To EBITDA Ratio, Financial Covenant

+ References

No definition available.

+ Details

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Namespace Prefix:	ontf_
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Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of a specific compensating balance arrangement that is maintained under an agreement for a bank loan or future credit availability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

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X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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X

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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X

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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